Homework pt.6
Since animals have nerve and muscle tissue and plants do not, which of the following events in earth’s history would be associated with adaptive radiation of many groups of animals, and not particularly that of plants?
Homework 5: increase in atmospheric O2
The opening of stomata (when guard cells swell) involves
Homework 7: an increase in the solute concentration of the guard cells
Biologists now routinely test for homology between genes in different species. If genes are determined to be homologous, how are they related to each other?
Homework 4: by descent from a common ancestor
Under which of these conditions would water loss by transpiration be greatest?
Homework 6: when the outside air is very dry
Is self-fertilization the same as asexual reproduction?
Homework 4: No, because self-fertilization involves meiosis and fertilization
What are the two most important functions in a plant that occur when stomata (leaf pores) open
Homework 6/7: intake of carbon dioxide for photosynthesis & evaporation of water for transpiration
Cottonwood, aspen, and willow trees have beige flowers, with no petals, that appear before the tree's leaves are out in the spring; and they produce male flowers on different individual trees from female flowers. What does this indicate about these trees?
Homework 7: Their pollen is dispersed by wind.
Which of the following is the set of taxa (vertebrate classes) that have amniotic eggs
Homework 4: Birds, Mammals, and Reptiles
What events happens in a plant reproductive cycle but NOT in a human reproductive cycle?
Homework 7: Haploid cells undergo mitosis to form haploid cells
Which of these traits are shared by cells of all organisms, and thus would be ancestral to all organisms?
Homework 4: use ATP as energy currency &
genome of DNA
What is the evolutionary advantage of a plant having specialized flower traits to attract only specific pollinators?
Homework 7: It will receive more pollen brought from other members of the same species
Plantlike photosynthesis that fixes CO2 and releases O2 occurs in
Homework 4: cyanobacteria
Water will tend to move into a plant cell that has what combination of conditions?
Homework 6/7: higher solute concentration and lower fluid pressure
Of the following, which of the following systems provides the MOST genetic variability
Homework 5: fertilization between flowers on different plants in same species
The egg nucleus 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?
Homework 7: The endosperm has 36 chromosomes
Which of the following would be an advantage of sexual reproduction instead of all asexual reproduction?
Homework 4: Greater combinations of genes among the offspring
What was probably the LEAST important factor in bringing about the Cambrian explosion of animal diversity?
Homework 5: the movement of animals onto land
Double fertilization means that
Homework 7: one sperm fertilizes the egg; a second to produce the endosperm
Which of these acting by itself causes net movement of water crossing a membrane?
Homework 6: Solute gradient
A fungus species has a diploid number of chromosomes 2n=50. One typical dikaryon cell of that species (not in the process of dividing) contains which?
Homework 5: two nuclei, each with 25 chromosomes
In which way could a flower’s specific color pattern serve as a reproductive isolating mechanism that prevents two species from interbreeding.
Homework 7: it attracts pollinators that only visit that color of flower
How could an anti-fungal treatment harm fungal parasites (like ringworm, athlete’s foot) but not humans (animals)?
Homework 5: It inhibits chitin cell wall formation
Which of these big evolutionary advances is NOT associated with a period of earth’s history when organisms successfully diversified and spread over large, continental land masses?
Homework 5: Cambrian Explosion
A person’s “staph” infection (Staphylococcus aureus) could be safely treated (safe because it doesn’t harm the person) with a drug that
Homework 4: prevents peptidoglycan synthesis
Fluids rise in very narrow tubes (like capillaries) because of:
Homework 6: adhesion & cohesion