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COC
BIOLOGY

Practice Questions for Midterm 2:

Note: The answers to these questions will be posted by Tuesday.

1. Enzymes are used to activate and speed up all types of cellular reactions, both endergonic and exergonic.  

a. Explain the difference between these two types of reactions.

b. Why would enzymes be necessary to activate exergonic reactions?

2. Fill in the blank below with the correct term and complete the statement with the correct explanation.

Allosteric regulation of enzymes is an example of a ______________ feedback loop because.... 

3. What is the role of oxygen in cellular respiration?

4. Where in the cell do the following processes of cellular respiration take place and what are the products of each of these reactions?

a) glycolysis

b) Kreb's cycle

c) electron transport chain

5. Below is a schematic diagram of the two parts of photosynthesis.  Fill in the blanks with the appropriate reactants or products. Note: each blank is for a single reactant or product.

6. List the key events that occur during the following phases of cell division/mitosis:

a) metaphase

b) telophase

c) anaphase

d) cytokinesis

e) prophase

f) interphase

7. Fill in the blanks below with either diploid or haploid to correctly complete the statement.

During meiosis, the parent cell is __________ and the daughter cells (gametes) are ___________.

8. You conduct a cross between two flowers for flower color and plant height. If the genotypes of the flowers are: PpTT x PPTt, what are resulting phenotypes and their proportions in the offspring? 
(Note: Purple (P) is dominant and white (p) is recessive; tall (T) is dominant and short (t) is recessive) 

a) 50% purple and tall; 50% white and tall 
b) 50% purple and tall; 50% purple and short 
c) 100% purple and tall 
d) 25% purple and tall, 50% purple and short, 25% white and short 
e) 25% purple and tall, 25% purple and short, 25% white and tall; 25% white and short

9. In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes. When two roan cattle are crossed, the phenotypes of the progeny are found to be in the ratio of 1 red:2 roan:1 white. Which of the following crosses could produce the highest percentage of roan cattle?

a) white x roan

b) roan x roan

c) red x white

d) red x roan

10. Why do X-linked conditions appear more frequently in males than in females?

11. A person who is heterozygous for the Huntington disease allele has offspring with someone who does not have HD. What proportion of their children will have HD?

a) 1/16
b) 1/10
c) 1/8
d) 1/4
e) 1/2

©2003-2004 Dilek Sanver-Wang, MS
Los Angeles, CA USA.  All Rights Reserved.