The ability to share other member;s toxin-degrading secretions
Answer: One advantage of participating in a biofilm is
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Although the Proconsul fossil has a monkeylike body, it is considered the oldest (20 mya) fossil with hominoid
features such as larger canine teeth. ____________________ Indicate whether the statement is true or false.
A billionaire buys a sterile volcanic island that recently emerged from the sea. To speed the arrival of conditions necessary for plant growth, the billionaire might be advised to aerially sow what over the island?
A) basidiospores B) spores of ectomycorrhizae C) soredia D) yeasts E) leaves (as food for fungus-farming ants)
Lederberg and Tatum used the bacterial strains bio- met- leu+ thr+ thi+ and bio+ met+ leu- thr- thi- in their
experiments to determine if genetic recombination occurs in bacteria. Would it have been better to use two strains with the genotypes met- leu+ and met+ leu- instead?
a. Yes, because it is easier to study 2 genes than 5 genes. b. Yes, because the met- leu+ and met+ leu- strains only have one mutation, which makes it easier for genetic recombination to occur. c. No, because the met- leu+ and met+ leu- strains only have one mutation. A single random mutation could restore methionine or leucine synthesis in the strains. d. No, because strains with only one nutrient-deficient gene can still grow on minimal medium. e. No, because cells have two genes that encode different versions of leucine, so the met+ leu- strain would still be able to grow on minimal medium.
Studies have shown that in the flowering plant Arabidopsis whether or not a root epidermal cell
develops a root hair is determined
a. by the distance of the cell from the root tip. b. from the timing of cell division. c. by positional information from cells of the root cortex. d. shortly after the eight-cell embryo stage. e. by the direction of cell division.