If a beaver eats the bark all the way around a tree trunk (a process called "girdling"), why does the tree die?

A) Water and minerals are no longer supplied to the leaves.
B) Cells of the lateral meristem can no longer divide.
C) The tree cannot continue to photosynthesize.
D) The tree is susceptible to insect and fungal diseases.
E) The phloem is damaged, and the transport of sugars ceases.


E

Biology & Microbiology

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Match the organelle to its function.

A) turgor pressure B) ribosome production C) support and flexibility D) synthesis of complex polysaccharides E) photosynthesis F) synthesis of secretory proteins G) detoxification of hydrogen peroxide H) contains pigments in flowers I) storage of hydrolase J) boundary of the cell K) protein synthesis L) oxidation of sugars M) cell shape and movement of organelles N) information center O) steroid synthesis 1) nucleus 2) mitochondrion 3) chloroplast 4) nucleolus 5) rough endoplasmic reticulum 6) smooth endoplasmic reticulum 7) extracellular matrix 8) cytoskeleton 9) chromoplast 10) Golgi complex 11) lysosome 12) peroxisome 13) central vacuole 14) ribosome 15) plasma membrane

Biology & Microbiology

The original source of new alleles is

a. crossing over. b. independent assortment. c. fertilization. d. mutation. e. more than one of these.

Biology & Microbiology

If you are cast up on a desert island with no fresh

water to drink, the level of which of the following will rise in your bloodstream in an effort to conserve water? a. erythropoietin b. oxytocin c. insulin d. antidiuretic hormone e. glucose

Biology & Microbiology

Mendel’s experiments on pea plants showed that genes are passed ____________________ from generation to

generation and that traits are not ____________________. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology