Question

science bowl questions
biology - 2
a) erythrocytes (pron: eh-rith-row-cites)
b) leukocytes (pron: lew-kah-cites)
c) erythroblasts (pron: eh-rith-rah-blast)
d) thrombocytes (pron: throm-bow-cites)
answer: b -- leukocytes

1. multiple choice: the condition in which there is a decrease in the number of white blood cells in humans is known as:

a) leukocytosis (pron: lew-ko-sigh-toe-sis)
b) leukopenia (pron: lew-ko-pea-nee-ah)
c) leukemia (pron: lew-kee-me-ah)
d) leukohyperia (pron: lew-ko-high-per-e-ah)
answer: b -- leukopenia

1. multiple choice: the smallest of the formed elements of the blood are the:

a) white cells
b) red cells
c) platelets
d) erythrocytes
answer: c -- platelets

1. multiple choice: which of the following statements concerning platelets is incorrect. platelets:

a) contain dna
b) are roughly disk - shaped
c) have little ability to synthesize proteins

Explanation:

Question 8

To solve this, we analyze each option:

• Leukocytosis: Increase in white blood cells (opposite of "decrease").
• Leukopenia: "Penia" means deficiency, so it refers to a decrease in white blood cells.
• Leukemia: A cancer of white blood cells (not just a decrease).
• Leukohyperia: Not a standard term for white blood cell decrease.

So the correct term for decreased white blood cells is leukopenia.

We recall the sizes of blood formed elements:

• White cells (leukocytes): Larger than platelets.
• Red cells (erythrocytes): Larger than platelets.
• Platelets (thrombocytes): The smallest formed elements in blood.
• Erythrocytes: Same as red cells, larger than platelets.

Thus, the smallest formed element is platelets.

Platelets are cell fragments (not full cells) and do not contain a nucleus (hence no DNA). They are disk - shaped and have limited protein - synthesis ability. So the incorrect statement is that platelets contain DNA.

Answer:

B -- leukopenia

Question 9