What adaptation do alcids have to aid in successful reproduction?
a. The males rest eggs on their feet
b. They have a pear shaped egg.
c. They lay a single egg at a time.
d. They lay eggs in protected areas on the beach.
b
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Generalized anaphylaxis may be quickly controlled with the use of antihistamines
Indicate whether this statement is true or false.
Some animals are capable of lowering their metabolism and drastically reducing activity as a survival method during the day to avoid heat or to survive the cold in the winter. What is this process called?
a. holometabolism b. vigor c. torpor d. lassitude
Which process(es) can generate recombinant gametes? (Select all that apply.)
A) crossing-over between two linked heterozygous loci B) independent assortment of two unlinked heterozygous loci C) segregation of alleles in a homozygote D) crossing-over between two linked homozygous loci
Which of the following statements about T-cells is NOT correct?
A) Lymphoid precursor cells migrate into thymus and mature into T-cells. B) TH Cells produce granzyme and perforin to lyse the target cells in the adaptive immune responses. C) More than 99% of T cells die in thymus during colony selection. D) T cells undergo both positive and negative selections during maturation. E) T cell receptors contain both variable domain and constant domain.