What is an internal regulator of the cell cyclea)cylins
b)growth factors
c)the mitotic spindle
d)cancer cells

Answers

Answer 1

Answer:

Answer:

a) Cyclins

Explanation:

The internal regulators of the cell cycle are cyclins and CDK (cyclin-dependent kinase). These are proteins that regulate the cell cycle in different checkpoints.

The cyclin proteins stimulate another kind of protein i.e. CDK, which helps in the entry and exit of cells in different checkpoints. The checkpoints are G1, S, and G2 phases. Without this protein regulation the cell cycle can't run properly, nondisjunction of chromosomes, and cancer may result.

The growth factors help in the migration of cells in different parts of the body. This causes cellular growth. These include hormones and enzymes.

Mitotic spindle/spindle fibers separate the double number of chromosomes and put them equally in 2 daughter cells. During the cell cycle, the spindle fibers are not active. It is active in cell division.

Cancer cells are uncontrolled growth of cells. This results due to the failure of cell cycle regulators. Thus cells divide rapidly.

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A)Fossil layers below the K-Pg boundary are younger than fossil layers above the K-Pg boundary.B) Non-avian dinosaur fossils are only found below the K-Pg boundary.

" C) Mammal fossils are not found below the K-Pg boundary as they appeared after the event.

D) Fossil layers containing dinosaurs and mammals are below the K-Pg boundary.

E) Fossil layers below the K-Pg boundary are older than fossil layers above the K-Ps boundary

Answers

Answer:

Explanation:

E(I copied off lil bro)

Is a horse a herbivore or carnivore or omnivore

Answers

A horse is an herbivore because they do not eat other animals. Horses strictly eat plants, grass, and hay and such. But not other animals.

yes a horse is a hervivore because it eat things such as plants, grass, and leave so yeah that explains it.

Contrast one major difference between selective breeding and genetic engineering

Answers

Selective breeding is where humans choose individual of the same species that have a trait that favors economic growth or any other benefits, then breeding these favorable species until most of the population are the species with the favorable genes. Meanwhile, genetic engineering is where human alters, changes, inserts DNA to modify organisms.

Therefore, one major difference is that selective breeding does not include altering the DNA, while genetic engineering is the altering of DNA.

which of the following is the correct path that water takes once it enters a plant. A. Leaves,stems and roots. B. Roots,leaves,stems, C.stems,roots,leaves D.roots,stems,leavs

Answers

The answer is D. Roots, Stems, Leaves. The water enters the plant from the soil through the root hair cells, travels up the stem to the leaves where photosynthesis takes place.

What is the point at which DNA strand is unzipped so that it can form new complimentary strands?

Answers

DNA is unzipped by helicase at the origin of replication. There are several origins of replications in eukaryotic DNA replication, while only one in prokaryotic replication.

Which of these diseases affects the body's largest organ, is caused by exposure to environmental stimulus, and is noninfectious?A) flu
B) AIDS
C) skin cancer
D) Parkinson's disease