If adult sponges are sessile, why can they still be classified as animals?
a. Sponge larvae are motile.
b. Sponges have beating flagella.
c. Sponges have an organ system.
d. Sponges have bilateral body symmetry.s
e. Sponges have a central nervous system.
a
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Which of the following cell types migrates to the lymphoid tissue after encountering pathogens in the skin or the mucous membranes?
A. Macrophages B. Dendritic cells C. Mast cells D. None of the choices are correct.
Which of the following enzymes unwinds the DNA helix during replication in E. coli?
A. primase B. DNA Pol I C. gyrase D. helicase E. SSB
A testcross consists of
1.a cross of two pure-breeding forms to find out which form of a gene is dominant. 2.a cross between two unknown forms to determine their genotypes. 3.a cross between an offspring and its parent. 4.a cross of an F1 hybrid to an individual that is homozygous recessive. 5.a cross of two F2 individuals to produce an F3 generation.
According to the mathematical model developed by Wayne Getz to predict the existence of asexual or
sexual reproduction within a population:a. the offspring produced by sexual reproduction would be most successful in a stable environment. b. clones produced by asexual reproduction would succeed in an unstable environment. c. both strategies would coexist under conditions of moderate change. d. one assumption is that the offspring of sexual reproduction will use resources in the same way. e. one assumption is that the offspring of asexual reproduction will use resources differently.