7. Gene expression may be regulated:
A) only during translation
B) only during transcription
C) during transcription and translation
D) only during replication
E) during replication and transcription

8. During anaphase of meiosis I toward opposing poles of cell are pulled:
A) whole chromosomes
B) sister chromatids
C) bivalents
D) fragments of sister chromatids
E) tetrads

9. One of a series of different versions of gene is called:
A) genome
B) haploid
C) diploid
D) allele
E) allosome

10. Which of the following genotypes would produce the smallest number of different gametes if the alleles are assorted independently?
A) aa BB Dd
B) AA BB DD
C) Aa Bb DD
D) Aa BB DD
E) Aa Bb Dd

11. Which of the following processes can decrease the genetic variation in natural populations?
A) recombination
B) immigration
C) mutagenesis
D) inbreeding
E) hybridization

12. Which of the following structures present in the embryos of higher plants develops into primary leaves of seedlings?
A) epicotyl
B) endosperm
C) radicle
D) hypocotyl
E) cotyledon

13. Which of the following organisms would be classified as primary consumer?
A) lion
B) Escherichia coli
C) barley
D) cow
E) Candida albicans

14. Which of the following characterizes monocotyledonous plants?
A) Their embryos have one cotyledon.
B) In their stems vascular bundles are usually arranged in ring.
C) Their flowers parts are usually in multiples of four or five.
D) They have usually taproot.
E) Their leaves usually have netlike veins.

15. Which of the following types of plants tissue transport water and minerals?
A) phloem
B) xylem
C) meristem
D) vascular cambium
E) epidermis

16. Which of the following require a host cell because they are not able to make proteins on their own?
A) Paramecium caudatum
B) Escherichia coli
C) Influenza virus
D) Saccharomyces cerevisiae E) Euglena viridis


17. Which of the organisms is not correctly labeled?
A) Bacteria – Staphylococcus aureus
B) Plantae – Pine
C) Fungi – Spider
D) Animalia – Lion
E) Viruses – HIV

18. Eutrophication is the process of:
A) vegetation succession in lakes
B) nutrient depletion of lakes
C) increase inflow of minerals in lakes
D) primary succession in lakes
E) biological renewal of aquatic ecosystems

19. Which of the following is a prezygotic isolating mechanism to prevent reproduction between species?
A) geographic isolation
B) zygotic mortality
C) isolation by hybrid sterility
D) isolation by hybrid breakdown
E) isolation by hybrid inviability.


20. Which of the following plant tissue is characteristic only for the leaves, but not for the roots?
A) xylem
B) phloem
C) epidermis
D) cambium
E) mesophyll

21. Rhizobium forms an endosymbiotic nitrogen fixing association with roots of:
A) pine
B) rice
C) rose
D) bean
E) coconut palm

22. Which of the following is found in an unusual high proportion in cells of cardiac muscle?
A) lysosomes
B) mitochondria
C) mRNA
D) Golgi apparatus
E) cell nucleus

23. Which of the following organisms would most likely be found at the top of an energy pyramid?
A) clams
B) sardines
C) sharks
D) kelp
E) mollusca


Meiosis
female gamete
Meiosis
male gamete
X
zygote
embryo

25. Echinococcosis disease is caused by:
A) Echinococcus
B) Diphyllobotrium
C) Trichinella
D) Enterobius
E) Fasciola

26. Which of the following organisms conduct ethanol fermentation?
A) yeasts
B) bears
C) spiders
D) barley
E) mushrooms

27. Steroids are not:
A) sex hormones
B) cholesterol
C) corticosteroids
D) bile acids
E) vitamin C

28. Which of the following is the right order of the four stages of food processing?
A) digestion, ingestion, absorption, elimination
B) ingestion, digestion, elimination, absorption
C) ingestion, digestion, absorption, elimination
D) digestion, ingestion, absorption, elimination
E) absorption, elimination, digestion, ingestion


29. Which of the following statements is true?
I. The pH of urine is close to neutral (7).
II. Urine is a liquid product of the body that is secreted by urinary system. III. Lack of vasopressin in the blood increases diuresis.
A) I
B) II
C) I, II, III
D) III
E) I, III


30. Which hormone is produced by the placenta?
A) progesterone
B) insulin
C) thyroxin
D) melatonin
E) glucagon

31. Which of the following is not characteristic for mammals?
A) mammary glands
B) hair
C) cold-blooded
D) three middle ears bones
E) sweat glands

32. All of the members of a particular species that live in one area are called a(an):
A) biotope
B) community
C) ecosystem
D) biosphere
E) population

Answer:

Omg questions are sooo long

Which of the following describes the product of Meiosis?
A. 4 genetically identical diploid cells
B. 4 genetically unique diploid cells
C. None of these are correct
D. 2 genetically unique haploid cells

Cells dispose of large waste molecules through a process called

osmosis.
diffusion.
exocytosis.
endocytosis.

Under normal conditions the sympathetic division is usually active in the body resting heart rates are influenced by nor epinephrine the parasympathetic system keeps heart rate lower than the heart would beat on its own. all of the above are true

HELP PLEASE FAST ASAP PLEASE HELP

In a study involving a cell-free translation system from coli, the polyribonucleotide AUGUUUUUUUUUUUU directs the synthesis of the oligopeptide fMet-Phe-Phe-Phe-Phe. In the presence of a new class of translation-targeting antibiotics that bind to the large ribosomal subunit, the ribosomal complex forms, the initiator tRNA binds the mRNA, the second tRNA enters the A site of the ribosome, but no peptide bonds form. Which of the following is a likely function of these new antibiotics?

a. Blocks peptidyl transferase activity
b. Inhibits tRNA aminoacyl synthetase function
c. Inhibits ribosomal translocation along the mRNA
d. Prevents anticodon base-pairing with the codon
e. Blocks binding of the Shine-Dalgarno box to the rRNA

reptilesimprovements over amphibians​

Which is our body part help us to maintain balance.

M. magneticum can only survive in low-oxygen environments, which are typically found near the bottom of bodies of water.

a. True
b. False

How do bacteria obtain energy to carry out their functions

Match the items of column 'A' with those of column 'B':
Turbidity
Reduces the light in the water column
Natural pollution
Choose
Nitrates and phosphates
Air pollution
Biochemical demand for oxygen
Contaminants into a natural environment
Chemical fertilizers
Pollution
Floating materials
Industrial wastes
Emissions pollution
Reduces the light in the water column
Concentration of hydrogen pH
Eutrophication
CFCS
New species invasion
Temperature
Harmful algal blooms
Oils fats, and foam
Please answer all parts of th Hypertrophication
Toxicity
Volcanic
In crude oil affect eggs and larvae of fish a
Atomic number
a. Hydrocarbon

tissues & Organs
allow
to transport
They
linked together to form
an
and
System can
form into Organis
- m. There
are
many
cell Jugncitions and
many
kind
of
Junctions. Specialized
celi junctions
Occur at points
Cell matrix and particular
epithelia. Three types of
Ven
ha
for
Q2 classify the
Short notes
tur
epithelial
On any
tissues
4 epithelial.
Humans. write a
Epithelial Tissues
squamous
Simple “Epithelium
compound
Simple columnar

vì sao DNA của Prokaryote phải siêu xoắn

Define Siamese twins

Describe fluid exchange between capillaries and the interstitial fluid. Be sure to discuss the forces (pressure) that moves the fluid and the direction in which fluid moves. (4 points) In one to three sentences, describe the role of lymphatic system in this fluid exchange. (3 points) g

Partes del sistema linfatico

100 POINTS!!!!!!
The theories surrounding the formation of our solar system are based on many

biased opinions
incorrect facts
non-testable data
scientific investigations

PLEASE HELP ME!!!! I am stuck.
The frequency of tasters and nontasters of PTC varies among populations. (Answer ALL questions)
- In population A, 94 percent of people are tasters (an autosomal dominant trait)
and 6 percent are nontasters.
- In population B, tasters are 75 percent and nontasters 25 percent.
- In population C, tasters are 91 percent and nontasters are 9 percent.

1. Calculate the frequency of the dominant (T) allele for PTC tasting in population A.
2. Calculate the frequency of the recessive (t) allele for nontasting in population A.
3. Calculate the frequency of the dominant (T) allele for PTC tasting in population B.
4. Calculate the frequency of the recessive (t) allele for nontasting in population B.
5. Calculate the frequency of the dominant (T) allele for PTC tasting in population C.
6. Calculate the frequency of the recessive (t) allele for nontasting in population C.
7. Assuming that Hardy-Weinberg conditions apply, determine the TT frequency in population A.
8. Assuming that Hardy-Weinberg conditions apply, determine the Tt frequency in population A.
9. Assuming that Hardy-Weinberg conditions apply, determine the tt frequency in population A.
10. Assuming that Hardy-Weinberg conditions apply, determine the TT frequency in population B.
11. Assuming that Hardy-Weinberg conditions apply, determine the Tt frequency in population B.
12. Assuming that Hardy-Weinberg conditions apply, determine the tt frequency in population B.
13. Assuming that Hardy-Weinberg conditions apply, determine the TT frequency in population C.
14. Assuming that Hardy-Weinberg conditions apply, determine the Tt frequency in population C.
15. Assuming that Hardy-Weinberg conditions apply, determine the tt frequency in population C.

which of the following trairs did Mendel not test
1.) Flower position
2.) Seed color
3.) Number of seeds
4.) Stem length​

Una de las aplicaciones más importa del electromagnetismo son

which of the specific classification is the specific organism found

Explain why succession allows an ecosystem to recover after a primary disturbance.

The largest population of a particular species that an ecosystem can support
is the ecosystem's
O A. biome
O B. biodiversity
O C. carrying capacity
O D. keystone species
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D
SA

what are microorganisms? write the living and non living characteristics of virus. ​

What is
FOOD & NUTRITON 1​

1. Discuss at least two attributes of a study that you would look for to determine whether or not it is rigorous.

The catabolic pathways that degrade fatty acids do not generate ATP directly, but produce NADH and acetyl-CoA.

a. True
b. False

what is the difference of biology and human and social biology?????

QUESTION 6
Which one of the following substances is not a product of aerobic respiration?
A.
ATP
B.
Water
C.
Alcohol
D. Carbon dioxide​

Which is the only element in group 1 on the periodic table that forms covalent bonds?

hydrogen
lithium
potassium
sodium
.

Which graph represents selection that may lead to reduced variation in a population?
A graph has trait value on the horizontal axis and population of individuals on the vertical axis. The original population and population after selection have similar curves, but the original population peaks before the population after selection.
A graph has trait value on the horizontal axis and population of individuals on the vertical axis. The population after selection increases, decreases, increases, and then decreases again. The original population increases at the point that the original population drops.
A graph has trait value on the horizontal axis and population of individuals on the vertical axis. The original population peaks at the same time as the population after selection but the population after selection peaks higher and at a more rapid speed.
A graph has trait value on the horizontal axis and proportion of individuals on the vertical axis. The original population and population after selection have similar curves but the original population is slightly higher at all points.