When a population reaches the carrying capacity of its habitat, the effects of crowding can be felt. Which of the following is not a density-dependent effect?
A. increased rate of reproduction
B. increased migration
C. increased aggression
D. increased time spent searching for food
Answer: A
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Which of the following proteins waterproof
skin?
a. collagen b. elastin c. keratin d. albumin e. myosin
Peripheral proteins are linked to either surface of the plasma membrane by:
a. covalent disulfide bonds. b. associating with fatty acids through hydrophobic interactions. c. associating with glycoproteins on the inner membrane surface. d. bonding to integral proteins through noncovalent interactions. e. embedding in one side of the membrane and, thus, not extending through to the other side.
A. Prostate gland B. Urinary bladder C. Urethra D. Ejaculatory duct E. Seminal vesicle F. Bulbourethral gland G. Vas deferens H. Epididymis I. Scrotum J. Testis
HIS4 trp1; HIS4 trp1; his4 TRP1; his4 TRP1
A haploid yeast strain has mating type a and genotype his4 TRP1. A different haploid yeast strain has mating type ? and genotype HIS4 trp1. The two strains mate and produce diploid offspring with genotype his4 TRP1 / HIS4 trp1. The diploid cells undergo meiosis to produce a variety of tetrad types. In the following questions, the genotypes of the spores in a tetrad are shown. For each tetrad, tell what type it is: parental (PD), non-parental (NPD), or tetratype (T). A) PD B) NPD C) T D) cannot be determined