A bacterium is unable to transport lactose into the cell to be broken down. Which gene is likely mutated in this bacterium?
A) lacZ
B) lacY
C) lacI
D) lacP
E) lacO
B
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What phase does it occur when each pole of the cell now has one new daughter nucleus, each with a haploid number of chromosomes
What will be an ideal response?
Which of the following statements is false?
a. All vertebrates have a ventral tubular nervous system. b. All vertebrates have a tail at some stage in their life cycle. c. All vertebrates have a notochord at some stage in their life cycle. d. All vertebrates have pharyngeal gill slits at some stage in their life cycle. e. None of these are false.
If the neuron is stimulated such that its membrane potential changes to 50 mV, what is the sign of the driving force for Cl- ions and in which direction will these ions move across the membrane?
a. Positive driving force; Cl- moves into the cell b. Positive driving force; Cl- moves out of the cell c. Negative driving force; Cl- moves into the cell d. Negative driving force; Cl- moves out of the cell.
Answer the following questions true (T) or false (F)
1. Water and plasma proteins make up about 99 percent of blood plasma. 2. Because they are cell fragments, not cells, platelets are a component of plasma, not a formed element. 3. Ions in plasma are also known as electrolytes.