# DBT JRF 2020 — Question 65

Exam: DBT JRF 2020 · Section: B · Topic: Bioinformatics · Difficulty: Easy

## Question

Genes related through vertical descent from a common ancestral gene are called

## Options

- **A.** orthologous
- **B.** xenologous
- **C.** paralogous
- **D.** heterologous

## Answer

Option A

## Explanation

CFU/mL calculation: Dilution factor: 1 mL culture added to 9 mL diluent = $\dfrac{1}{10}$ dilution factor ( $10^{-1}$ ). Volume plated: 200 μL = 0.2 mL. Colonies counted: 150. Formula: $\text{CFU/mL} = \dfrac{\text{Colonies counted}}{\text{Volume plated (mL)} \times \text{Dilution factor}} = \dfrac{150}{0.2 \times 0.1} = \dfrac{150}{0.02} = 7500 \text{ CFU/mL}$ .

Source: https://mypyqbuddy.com/questions/genes-related-through-vertical-descent-from-a-common-6a05a8a02adafec470293259