If you looked at unknown cells under a microscope, what could lead you to correctly conclude that they are prokaryotic cells?
A) They appear to have a cell wall.
B) They lack a nucleus.
C) They are oblong in shape.
D) They form a colony.
B
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The partial negative charge in a molecule of water occurs because _____
A) the oxygen atom donates an electron to each of the hydrogen atoms B) the electrons shared between the oxygen and hydrogen atoms spend more time around the oxygen atom nucleus than around the hydrogen atom nucleus C) the oxygen atom has two pairs of electrons in its valence shell that are not neutralized by hydrogen atoms D) the oxygen atom forms hybrid orbitals that distribute electrons unequally around the oxygen nucleus E) one of the hydrogen atoms donates an electron to the oxygen atom
Drought affects human society by causing
a. widespread crop failure. b. dried up wells. c. livestock death. d. human starvation. e. all of these.
Without teleomerase, what would happen to DNA over a long period of time?
A. The chromosome would disappear B. The chromosome would stay the same C. The chromosome would elongate D. The chromosome would shorten
The egg of a plant has a haploid chromosome number of 12 (n = 12). What is true about the number of chromosomes in the cells of other tissues of this plant?
A) The sperm has 6 chromosomes. B) The leaves and stems have 12 chromosomes. C) The zygote has 12 chromosomes. D) The endosperm has 36 chromosomes.