The cell formed through fertilization of an egg by a sperm is called a/an
A. gamete
B. sperm cell
C. zygote
D. egg cell
E. ovum
Ans: C. zygote
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Choose the true statement(s) about the evolutionary divergence of horses in North America. Check all that apply.
_____ Most changes are seen as adaptations for life in grassland habitats. _____ The general trends during horse evolution are increase in body size, lengthening of limbs, reduction of digits on both sets of limbs, and tooth development for a grazing life style. _____ Horse evolution is unusual in that rates of change were uniform and constant throughout most lineages. _____ Living lineages of horses show much less diversity than existed in the past.
Which of the following statements is TRUE?
a. Bryophytes have a short-lived sporophyte phase. b. Bryophytes lack true leaves and stems but possess true roots. c. Zygotes of bryophytes are released into the environment after their formation. d. Bryophytes do not reproduce asexually. e. Bryophytes produce male and female gametophytes that are identical in appearance.
What is the function of a protein kinase?
A. To add phosphate groups onto proteins B. To cleave membrane phospholipids C. To phosphorylate GDP to generate GTP D. To remove phosphate groups from proteins
Which of these descriptions is associated with the luteal phase of the uterine cycle?
A. high LH, high estrogen, developing follicle, uterine lining breakdown B. low FSH, high estrogen, developing follicle, increase in uterine lining C. decrease in LH, increase in progesterone, corpus luteum present, secretory uterine lining D. decrease in LH, decrease in progesterone, corpus luteum present, secretory uterine lining E. increase in LH, increase in progesterone, corpus luteum present, endometrium released