Which of these is a reasonable definition of a gene based on current understanding of biology?
Answer: A gene codes for one or more related RNAs or polypeptides.
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When erythrocytes are old or die, how are they removed from the blood stream?
1.The liver filters them out. 2.They break into small particles and are cleared out by the kidneys. 3.They dissolve into liquid and circulate in that form in the blood. 4.They are attacked by macrophages and removed. 5.They remain intact, dead cells and are filtered out by the kidneys.
The flow of energy among living organisms is best
characterized as a. circular. b. a ladder. c. a lattice. d. one way. e. a funnel.
Which of the following statements is false?
a. HIV is the virus that causes AIDS. b. The AIDS virus is a retrovirus. c. The AIDS virus attacks macrophages, dendritic cells, and helper T cells. d. Even though the AIDS virus does not have its own DNA, it causes the host to produce DNA that will become part of host chromosomes. e. Antibodies to the AIDS virus can be detected immediately after infection occurs.
Which of the following statements about the endoplasmic reticulum (ER) is false?
(a) The ER is the major site for new membrane synthesis in the cell. (b) Proteins to be delivered to the ER lumen are synthesized on smooth ER. (c) Steroid hormones are synthesized on the smooth ER. (d) The ER membrane is contiguous with the outer nuclear membrane.