Practice Questions

TLS Online TPP Program

#Question id: 4605

Over long periods of time, many cave-dwelling organisms have lost their eyes. Tapeworms have lost their digestive systems. Whales have lost their hind limbs. How can natural selection account for these losses?

#XL - T Zoology

Natural selection cannot account for losses, but accounts only for new structures and functions.
Natural selection accounts for these losses by the principle of use and disuse.
Under particular circumstances that persisted for long periods, each of these structures presented greater costs than benefits.
The ancestors of these organisms experienced harmful mutations that forced them to lose these structures.

More Questions

TLS Online TPP Program

#Question id: 3056

#XL - S Microbiology

Ten bacteria were inoculated into a rich medium. If at the end of ten hours the total number of cells is 10^4, then the number of elapsed generations and the generation time respectively is

TLS Online TPP Program

#Question id: 18380

#XL - S Microbiology

A commonly used municipal wastewater treatment to restart activated sludge bioreactors. Which technique is involved in this remediation process?

TLS Online TPP Program

#Question id: 12926

#XL - S Microbiology

PCR is undertaken with a fluorescence reporter / quencher pair called______

TLS Online TPP Program

#Question id: 3029

#XL - S Microbiology

Which of the following obtain energy by oxidizing inorganic substances; energy that is used, in part, to fix CO2?