Intracytoplasmic sperm injection (ICSI) is used by couples in which the _____
a. female has blocked oviducts
b. female has very irregular ovulation
c. female is approaching menopause
d. source of sperm is a sperm bank
e. male is infertile
e
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The first United States Marine Biological Laboratory was started by:
a. Charles Wyville Thomson. b. Sir Alistair Hardy. c. Charles Darwin. d. Louis Agassiz. e. Alexander Agassiz.
How do males and females differ as they age?
A. Females undergo menopause, but males do not undergo any changes in their reproductive hormone levels. B. Males can continue to produce sperm until death, but females do not continue to produce eggs. C. Females dehydrate faster than males do. D. Males lose skeletal muscle mass, but females tend to gain muscle mass. E. Males develop urinary incontinence, but females do not.
Which of the following structures is common to plant and animal cells?
a. chloroplast b. wall made of cellulose c. tonoplast. d. mitochondrion e. centriole
You discover a unicellular organism that moves by what appear to be pseudopodia. You conclude that this organism is ________
A) either a type of amoeba or a type of slime mold B) a type of bacterium C) a type of alga D) either a type of ciliate or a type of apicomplexan