Carbon has an atomic number of 6. Carbon-14 has _____
a. 6 neutrons and 6 protons
b. 6 neutrons and 8 protons
c. 8 neutrons and 6 protons
d. 14 neutrons and 6 protons
e. 14 protons and 6 neutrons
ANSWER: c
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Which of the following statements describes a eukaryotic chromosome?
A) a single strand of DNA B) a series of nucleosomes wrapped around two DNA molecules C) a chromosome with different numbers of genes in different cell types of an organism D) a single linear molecule of double-stranded DNA plus proteins
Sepia apama cuttlefish mollusk males and females
A. live in populations of equal proportions, producing equal probability of reproductive success. B. can't mate successfully unless they are among the larger individuals in the population. C. are opportunistically hermaphroditic, able to mate as either male or female depending on the population needs. D. are sexually dimorphic, having different arm lengths and colorations. E. mate during the warm spring season.
In the accompanying figure, which of the following represents a multicellular, diploid reproductive stage??
a. 1
b. 2
c. 3
d. 4
e. 5
At which time period(s) during PCR thermocycling is/are hottest in temperature?
A) during DNA denaturation B) during primer annealing C) during primer extension/elongation D) Both the first and last cycles are hotter in temperature than all other cycles.