The half-life for radioactive isotope “Y” is 11 days.  If a patient receives 112 mg of “Y”, how many days will it take for the radioactive dose to decay to 1.75 mg?

True or False: a chemical system made of NH4+ and NH3 is a buffer.

True or False: in the balanced nuclear reaction below, the unknown species (i.e., XXX) is an gamma ray. 235U

A scientist wants to develop a genetically modified tree that already produces large female cones, where the seeds are protected in dormancy until fertilized by sperm coming from softer male cones. What plant category would be a good place to select a tree from so that it will already have these features?

Which of the following is not a type of plant tissue?

This field of study lies within the field of botany and focuses on various plant shapes and structures that make up lifeforms.

What plant spores are used in theatrical explosions and at one time were used for flash photography?

What organelle in plants uses sunlight, carbon dioxide, and water to create glucose?

Which of the following is true regarding the sporophyte generation in a plant’s life cycle?

Identify the source of the following quotation:   He made a step towards the shrub with extended hand; but Beatrice darted forward, uttering a shriek that went through his heart like a dagger. She caught his hand and drew it back with the whole force of her slender figure. Giovanni felt her touch thrilling through his fibres. “Touch it not!” exclaimed she, in a voice of agony. “Not for thy life! It is fatal!”