A student examining leaf cross sections under a microscope finds many loosely packed cells with relatively thin cell walls. The cells have numerous chloroplasts. What type of cells are they?
A) parenchyma
B) endodermis
C) collenchyma
D) sclerenchyma
A
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A population of charmingly charismatic rodents, population A, lives on a small island. The population consists of 100,000 individuals. Are all individuals of A genetically identical?
A. yes B. no
The degree of relatedness of two members of a pedigree is calculated using _____
A. The calculation of average heterozygosity B. The Hardy-Weinberg rule C. The coefficient of inbreeding D. The chi-square test
If melanocyte-stimulating hormone were increased, you would expect
a. changes in kidney function for retention of water. b. increase in reproductive or estrus cycles. c. increase in heat loss from the body surface. d. increase in pigmentation in the skin. e. decrease in milk production in females.
Which of the following is NOT a basic feature of all cells?
a. plasma membrane b. cytosol c. cell wall d. chromosomes