What are the places in the cell cycle where proteins survey the cell to make sure that conditions for a favorable cell division have been met?
What will be an ideal response?
checkpoints
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During animal development, a fertilized egg divides to form a ball of undifferentiated cells called a:
A. blastula. B. gastrula. C. meristem. D. zygote. E. neurula.
Which two structures will help the plant conserve water during times of drought?
a. Stomata and porous roots b. Stomata and cuticle c. Cuticle and broad surface area on the leaves d. Cuticle and porous roots e. Stomata and porous epidermis
Evidence that exposure to song is important in white-crowned sparrows learning to sing includes which of the following?
A. They need to hear songs from other male white-crowned sparrows from 10–50 days after hatching. B. They need to hear songs from any sparrow from 10–50 days after hatching to sing properly. C. White-crowned sparrows raised in a laboratory cannot learn how to sing properly. D. They must imprint on their father to learn how to sing their song properly. E. They will not produce any song at all if they do not hear other birds sing.
Teri brings her husband, Liam, with her to the gym and signs them both up for a one-hour aerobics class. After 20 minutes, Liam is visibly fatigued, even though he is a regular at the gym, lifting weights and playing basketball
What might explain why he is fatigued while his wife, although working hard, is not struggling? A) Females use more fat for energy and endurance exercises. B) Males have very little fat from which to obtain energy during endurance exercises. C) Males are better at team sports than at individual exercise programs. D) Teri's husband must not have eaten before coming to the gym.