BIOLOGY HIGH SCHOOL

There are two checkpoints during the cell cycle that regulate cell division. They are right before the _____ phase and _____ phase. S; M G1; G2 S; G1 M; G2

Answers

Answer 1
Answer: Two checkpoints during the cell cycle that regulate cell division are right before S phase and M phase.

Cell cycle checkpoints are control mechanisms necessary for proper cell division. In the cell cycle, there are two checkpoints: the G1 checkpoint and the G2 checkpoint. The G1 checkpoint is right before the S phase, and G2 checkpoint is right before the M phase.
If something is wrong at the G1 checkpoint, the cell will not enter the cell cycle. It is important to be delayed before cell enters S phase where DNA replication commences.
The G2 checkpoint is a DNA damage checkpoint and if DNA is damaged, entering the cell cycle is delayed before mitosis (M phase).
Answer 2
Answer:

Answer:Sphase and Mphase

Explanation:

Related Questions

Removal of phloem tissue leads to gradual death of the plant. Why does this happen?A. Distribution of carbohydrates from the leaves to the other parts of the plant is affected.B. Distribution of water and nutrients from the roots to the other parts of the plants is affected.C. Distribution of water and nutrients to the flowers affects seed formation
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Suppose that a dominant allele (P) codes for a polka-dot tail and a recessive allele (p) codes for a solid colored tail. If two heterozygous individuals with polka-dot tails mate, what's the probability of the phenotype and genotype combinations of the offspring?A. 50 percent chance of a polka-dot tail and 50 percent chance of a solid colored tail (50 percent PP; 50 percent pp) B. 75 percent chance of a polka-dot tail and 25 percent chance of a solid colored tail (75 percent Pp; 25 percent pp) C. 75 percent chance of a polka-dot tail and 25 percent chance of a solid colored tail (25 percent PP; 50 percent Pp; 25 percent pp) D. 25 percent chance of a polka-dot tail and 75 percent chance of a solid colored tail (25 percent PP; 50 percent Pp; 25 percent pp)
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Water molecules are polar, which give water its unique properties. One important property is water is the universal ________A. Solvent

B. Drink

C. Liquid

D. Solute

Answers

Answer:

A. solvent

Explanation:

Its called the universal solvent because its capable of dissolving more substances than any other liquid.

Networks of blood vessels in bats' wings serve only to disperse heat generated in flight. This heat is generated only because bats flap their wings. Thus paleontologists' recent discovery that the winged dinosaur Sandactylus had similar networks of blood vessels in the skin of its wings provides evidence for the hypothesis that Sandactylus flew by flapping its wings, not just by gliding.The argument in the passage relies on which of the following assumptions?

(A) Sandactylus would not have had networks of blood vessels in the skin of its wings if these networks were of no use to Sandactylus.
(B) All creatures that fly by flapping their wings have networks of blood vessels in the skin of their wings.
(C) Winged dinosaurs that flapped their wings in flight would have been able to fly more effectively than winged dinosaurs that could only glide.
(D) If Sandactylus flew by flapping its wings, then paleontologists would certainly be able to find some evidence that it did so.
(E) Heat generated by Sandactylus in flapping its wings in flight could not have been dispersed by anything other than the blood vessels in its wings.

Answers

Answer:

(A) Sandactylus would not have had networks of blood vessels in the skin of its wings if these networks were of no use to Sandactylus.

Explanation:

The given passage compares presence of similar structures, the blood vessels, in the wings of bats and winged dinosaur Sandactylus to explain the unknown function of wings in the dinosaur species. Bats are flying mammals and use wings to fly. The blood vessels in their wings serve to spread out the heat that is produced by flapping of wings during flying.

The presence of blood vessels in wings of dinosaur Sandactylus suggests that they also used wings for flying. If Sandactylus species did not use the wings for flying, their wings should not have blood vessels as gliding movement does not require it.

What does oxidation involve?A. A loss of electrons
B. A gain of electrons
C. A loss of oxygen
D. A gain of hydrogen

Answers

the answer is A. A loss of electrons
Oxidation involves a loss electrons. And also the oxidation state of the elements rises.

Which is an example of hybridization that would increase hybrid vigor?

Answers

Hybridization by sexual reproduction

Hybrid organisms contain DNA from both male and female parents but cloned organisms contain DNA from only one type of parent. Hybrid has superior character over its parents (improved hybrid vigor) but clones are 100% identical to their parent. Hybridization gives only one hybrid progeny, whereas through cloning unlimited identical organisms can be produced.

Gene expression in prokaryotes is regulated at which stage?

Answers

Gene expression in prokaryotes can be regulated at multiple stages including transcriptional and co-translational. Operons respond routinely to the presence of specific metabolites and change the availability of activators and repressors while speific end products of biosynthetic pathways can regulate the translatability of mRNAs for new proteins.

What is meant by anterior and posterior region in our body?

Answers


"Anterior" means 'nearer to the front'.  The anterior region of the body
is the region that includes the parts that are nearer to the front, like
toes and eyes.

"Posterior" means 'further back in position'.  The posterior region of the
body is the region that includes the parts whose position is further back,
like buttocks and heels.
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