Oxygen-16 is abundant and has 8 protons and 8 neutrons. Oxygen-18 is a(n) ________ of oxygen-16.
A. ion
B. dimer
C. isomer
D. isotope
Answer: D
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Mashing is a process involving ________.
A. carbohydrate hydrolysis B. protein putrefaction C. inoculation D. carbonation
Which structure holds homologous chromosomes tightly together and supports them as they undergo recombination?
a. kinetochore b. centromere
c. microtubules d. spermatozoa e. synaptonemal complex
Because of fluctuations in the environment, such as depletion of food supply or an outbreak of disease,
a population may periodically experience a rapid and marked decrease in number of individuals, leading to a form of genetic drift called
a. a founders effect. b. migration. c. gene flow. d. natural selection. e. a genetic bottleneck.
Bt crops are an insect-resistant GM plant. Bt crops are used mainly because the cry proteins, which confer the insecticidal properties, are shown to ________
A) pollute the ground water B) have few negative effects on humans C) break down slowly in sunlight D) only target a few pest species