Answer the following statements true (T) or false (F)
1. One function of cell walls in plants is to prevent the continual increase in the expansion of the cell membrane.
2. The plant cell can move substances into cells using proton pumps that work against a gradient.
3. Diffusion of water across membranes occurs through channels formed by proteins known as aquaporins.
4. Active transport in plants works against a concentration gradient and this allows for substances to pass through plant cells without an energy input.
5. If your plants are wilted, this is an indication that the turgor pressure in cells of that plant are low.
1. TRUE
2. TRUE
3. TRUE
4. FALSE
5. TRUE
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Which of the following statements about Archaeopteryx is FALSE?
A. It is the ancestor of modern birds. B. It shows a combination of reptilian and bird -like features. C. It provided clear evidence of the close relationship between birds and dinosaurs. D. It had a long, bony, reptilian tail. E. It had asymmetrical feathers like a modern bird.
Our ability to respond to moderate heat and cold is due to
A. mechanoreceptors. B. thermoreceptors. C. nociceptors. D. electromagnetic receptors. E. chemoreceptors.
Organisms of the domains Archaea and Bacteria are composed of Eukaryotic cells
1.True 2.False
Which of the following statements about DNA methylation in eukaryotes is false?
(a) Appropriate inheritance of DNA methylation patterns involves maintenance methyltransferase. (b) DNA methylation involves a covalent modification of cytosine bases. (c) Methylation of DNA attracts proteins that block gene expression. (d) Immediately after DNA replication, each daughter helix contains one methylated DNA strand, which corresponds to the newly synthesized strand.