Category: Biology

7. Since all cells originated from a single-celled zygote, it means that they must contain the same DNA. If this is true,
how it is possible for there to be so many different types of
cells with different structures and functions?
A. Mutations in DNA during DNA replication prior to mitosis lead to different cell types.
B. During DNA replication and mitosis, sections of DNA not being used by the cell are cut
out and discarded.
C. Cells only use the genes in the DNA needed for specific cell type.
D. None of the answers above are correct.
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The female reproductive system in humans differs from the human male reproductive system in that it is solely responsible for

What is energy? A) anything that has mass

B) anything that takes up space

C) the ability to do work

D) the ability to conduct current

(11) which of the following will most likely lead to succession from a pond to a terrestrial ecosystem
a) a decrease in biodiversity
b) a decrease in the number of producers in the pond
c) removal of decomposers
d) an increases in sediment, decaying leaves, and tree branches in the pond

(12) why do some vegetarians argue that humans should directly eat producers instead of eating consumers that ate producers?
a) primary consumers are the least numerous in an ecosystem
b) producers are considered to be the climax community
c) most of the available energy is lost at each trophic level

(13) all of the following describe biotic factors expect
a) decomposers
b) saprobes
c) predators
d) nitrogen

(14) a type of bird known as a cattle egret follows livestock around in fields. as the livestock graze, they stir up insects that the cattle egret can then eat. the livestock is unaffected by the cattle egret. this relationship illustrates
a) commensalism
b) mutualism
c) carrying capacity
d) parasitism

(15) how do humans interfere with the carbon cycle?
a) humans perform cellular respiration, which utilize carbon dioxide and releases oxygen
b) humans burn fossil fuels, which release carbon dioxide into the environment
c) humans clear land and remove producers, which decreases oxygen and increases carbon dioxide levels
d) both b & c

The respiratory system allows for gas exchange to happen in the lungs. how does the respiratory system affect the cardiovascular system? the respiratory system supplies the carbon dioxide that the cardiovascular system transports to the different cells for the production of energy. the respiratory system supplies the oxygen that the cardiovascular system transports to the different cells for the production of energy. the cardiovascular system supplies the carbon dioxide that the respiratory system transports to the different cells for the production of energy. the cardiovascular system supplies the oxygen that the respiratory system transports to the different cells for the production of energy.

Which blood samples can be tested with blood type b+ reccesive?

How is the fluidity of the cell membrane maintained?

El oxígeno liberado durante la fotosíntesis proviene de la molécula de agua ?

What evidence supports the idea that a supernova remnant was involved in earth’s formation? the earth supports life. the earth orbits a star. there is no evidence to support this claim. the earth has an iron core.

A virus uses theon the outside of its body to unlock and enter our cells. This object on the outside is also known as an antigen and can be identified by the immune system to fight the virus in the future.