If you were developing artificial B-cell receptors (BCRs) based on the natural version and wanted to change the BCRs' ability to bind certain antigens, which region of the natural receptor would you alter?
A) transmembrane domain
B) amino terminus of light and heavy chains
C) carboxy terminus of light and heavy chains
D) the region projecting into the cytosol of the cell
Answer: B
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All of the following are adaptations of sea snakes to a marine existence except:
a. trachea acting as accessory lung. b. gas exchange across their skin. c. oviparous reproduction. d. lower metabolic rate during submergence. e. flattened paddle tail.
The letter “C” from above represents which of the
following? a. the excretory pore b. loops where blood vessels take up solutes from the blood c. sexual reproductive organ of the planarian d. cilia which flick to draw fluid into the planarian e. none of these
Which of the following describes the fate of most of the water taken up by a plant?
a) It is used as a hydrogen source in photosynthesis. b) It is used as a solvent. c) It makes cell elongation possible. d) It is lost during transpiration. e) It is used to keep cells turgid.
The "grandmother hypothesis" suggests that natural selection may have favored a woman ________
A) moving away from her children and grandchildren B) focusing her energy on caring for her grandchildren, instead of producing more children C) focusing her energy on the production of as many children as possible before reaching menopause D) helping her sisters produce more children