Which characteristic promoted the utilization of lipids as the first cell membrane?
A) spontaneous degradation of the intracellular environment
B) self-assembly into a simple membrane
C) ability to form an impermeable membrane
D) formation of a semi-solid membrane
Answer: B
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Which of these is not an example of coevolution between flowers and pollinating bees?
A. Bees have tongues to lap up nectar. B. Some bees are hairy to collect and carry pollen. C. Flowers have ultraviolet markings visible to bees but invisible to most other insects. D. Some flowers are bright red with long tubes to hold nectar. E. Bees have strong preferences for particular types of flowers and remember where the plants are located.
If strain a and strain b conjugate, the most likely outcome of their offspring would be:
a. bio- met- leu- thr- thi+. b. bio+ met+ leu- thr+ thi+. c. bio+ met- leu- thr- thi+. d. bio+ met+ leu- thr- thi+. e. bio- met- leu- thr- thi-
The type of plant cell that provides rigid support and is dead at maturity is a cell.
A. sieve tube B. guard C. parenchyma D. sclerenchyma E. collenchyma
The carotenoids and other accessory pigments in the chloroplast help capture light into the reaction center's chlorophyll molecules
Indicate whether the statement is true or false