In some rare salamander species, all individuals are females. Reproduction relies on those females having access to sperm from males of another species. However, the resulting embryos receive no genetic contribution from the males. Why do you think sperm are necessary for reproduction?

TLS Online TPP Program

#Question id: 45

#XL - Q Biochemistry

What is the standard free-energy change, ΔG°, under physiological conditions (E. coli grows in the human gut, at 37 °C) for the following reaction? (Keq = 7.8 × 10^2)

Glucose + ATP → glucose 6-phosphate + ADP

TLS Online TPP Program

#Question id: 20201

#XL - P Chemistry

Which of the following statements in relation to the hydrogen atom is correct?

TLS Online TPP Program

#Question id: 13203

#XL - R Botany

Intermediary cells are specialized companion cells that are involved in phloem loading in the plant. Which of the following pathway that have included the intermediary-type companion cells?

TLS Online TPP Program

#Question id: 34076

#XL - S Microbiology

Which of the following are methods used to obtain a pure culture in microbiology?

A. Streak plate method

B. Pour plate method

C. Spread plate method

D. Roll-tube method

E. Enrichment culture

TLS Online TPP Program

#Question id: 5097

#XL - T Zoology

The embryonic precursor to the human spinal cord is the ________.