Which scientist(s) discovered the basis for the base-pair rule, which states that the amounts of thymine and adenine are
always equal in all DNA molecules, as are the amounts of cytosine and guanine?
a. Watson and Crick
b. Beadles
c. Chargaff
d. Franklin
e. Pauling
ANSWER: c
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During breeding season, female northern elephant seals pick areas of the beach that are relatively protected and remain out of tidal changes. These are some of the "best" places to have their young
These areas are also where they will mate before going back out into the sea to forage for the next eight months. How does this choice reflect sexual selection? A. Pups born on these beaches are more likely to survive to reproduce. B. Females found on these beaches are more likely to have offspring that will survive to reproduce. C. These areas on the beach are more likely to be defended by larger and stronger males. D. These areas on the beach are where closely related females will have their offspring.
The physical structure of the capillaries in the nephron ____
a. ensures balanced filtration b. prevents proteins from filtering into urine c. allow blood cells to pass readily out of the kidneys d. hold in salt ions e. block foreign metabolites from entering the urinary tract
Genetic inheritance is based on what type of molecule?
A) Proteins B) DNA C) mRNA D) Enzymes
Protozoans are usually multicellular and found in arid environments
Indicate whether this statement is true or false.